Examples of org.h2.store.Data

org.h2.store.Data
This class represents a byte buffer that contains persistent data of a page.

            writeData();
            // free up the space used by the row
            Row r = rows[0];
            rowRef = new SoftReference<Row>(r);
            rows[0] = null;
            Data all = index.getPageStore().createData();
            all.checkCapacity(data.length());
            all.write(data.getBytes(), 0, data.length());
            data.truncate(index.getPageStore().getPageSize());
            do {
                int type, size, next;
                if (remaining <= pageSize - PageDataOverflow.START_LAST) {
                    type = Page.TYPE_DATA_OVERFLOW | Page.FLAG_LAST;

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                    if (r != null) {
                        return r;
                    }
                }
                PageStore store = index.getPageStore();
                Data buff = store.createData();
                int pageSize = store.getPageSize();
                int offset = offsets[at];
                buff.write(data.getBytes(), offset, pageSize - offset);
                int next = firstOverflowPageId;
                do {
                    PageDataOverflow page = index.getPageOverflow(next);
                    next = page.readInto(buff);
                } while (next != 0);
                overflowRowSize = pageSize + buff.length();
                r = readRow(buff, 0, columnCount);
            }
            r.setKey(keys[at]);
            if (firstOverflowPageId != 0) {
                rowRef = new SoftReference<Row>(r);

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    public int addRows(ArrayList<Value[]> rows) {
        if (sort != null) {
            sort.sort(rows);
        }
        Data buff = rowBuff;
        long start = file.getFilePointer();
        ByteArrayOutputStream buffer = new ByteArrayOutputStream();
        int bufferLen = 0;
        for (Value[] row : rows) {
            buff.reset();
            buff.writeInt(0);
            for (int j = 0; j < columnCount; j++) {
                Value v = row[j];
                buff.checkCapacity(buff.getValueLen(v));
                buff.writeValue(v);
            }
            buff.fillAligned();
            int len = buff.length();
            buff.setInt(0, len);
            if (maxBufferSize > 0) {
                buffer.write(buff.getBytes(), 0, len);
                bufferLen += len;
                if (bufferLen > maxBufferSize) {
                    byte[] data = buffer.toByteArray();
                    buffer.reset();
                    file.write(data, 0, data.length);
                    bufferLen = 0;
                }
            } else {
                file.write(buff.getBytes(), 0, len);
            }
        }
        if (bufferLen > 0) {
            byte[] data = buffer.toByteArray();
            file.write(data, 0, data.length);

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        }
    }


    private void readRow(ResultDiskTape tape) {
        int min = Constants.FILE_BLOCK_SIZE;
        Data buff = rowBuff;
        buff.reset();
        file.readFully(buff.getBytes(), 0, min);
        int len = buff.readInt();
        buff.checkCapacity(len);
        if (len - min > 0) {
            file.readFully(buff.getBytes(), min, len - min);
        }
        tape.pos += len;
        Value[] row = new Value[columnCount];
        for (int k = 0; k < columnCount; k++) {
            row[k] = buff.readValue();
        }
        tape.buffer.add(row);
    }

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            try {
                store.init();
            } catch (Exception e) {
                writeError(writer, e);
            }
            Data s = Data.create(this, 128);
            seek(0);
            store.readFully(s.getBytes(), 0, 128);
            s.setPos(48);
            pageSize = s.readInt();
            int writeVersion = s.readByte();
            int readVersion = s.readByte();
            writer.println("-- pageSize: " + pageSize +
                    " writeVersion: " + writeVersion +
                    " readVersion: " + readVersion);
            if (pageSize < PageStore.PAGE_SIZE_MIN || pageSize > PageStore.PAGE_SIZE_MAX) {
                pageSize = Constants.DEFAULT_PAGE_SIZE;
                writer.println("-- ERROR: page size; using " + pageSize);
            }
            long pageCount = length / pageSize;
            parents = new int[(int) pageCount];
            s = Data.create(this, pageSize);
            for (long i = 3; i < pageCount; i++) {
                s.reset();
                seek(i);
                store.readFully(s.getBytes(), 0, 32);
                s.readByte();
                s.readShortInt();
                parents[(int) i] = s.readInt();
            }
            int logKey = 0, logFirstTrunkPage = 0, logFirstDataPage = 0;
            s = Data.create(this, pageSize);
            for (long i = 1;; i++) {
                if (i == 3) {
                    break;
                }
                s.reset();
                seek(i);
                store.readFully(s.getBytes(), 0, pageSize);
                CRC32 crc = new CRC32();
                crc.update(s.getBytes(), 4, pageSize - 4);
                int expected = (int) crc.getValue();
                int got = s.readInt();
                long writeCounter = s.readLong();
                int key = s.readInt();
                int firstTrunkPage = s.readInt();
                int firstDataPage = s.readInt();
                if (expected == got) {
                    logKey = key;
                    logFirstTrunkPage = firstTrunkPage;
                    logFirstDataPage = firstDataPage;
                }

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        }
        return "[" + type + "]";
    }


    private void dumpPageStore(PrintWriter writer, long pageCount) {
        Data s = Data.create(this, pageSize);
        for (long page = 3; page < pageCount; page++) {
            s = Data.create(this, pageSize);
            seek(page);
            store.readFully(s.getBytes(), 0, pageSize);
            dumpPage(writer, s, page, pageCount);
        }
    }

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        }
    }


    private void dumpPageLogStream(PrintWriter writer, int logKey,
            int logFirstTrunkPage, int logFirstDataPage, long pageCount) throws IOException {
        Data s = Data.create(this, pageSize);
        DataReader in = new DataReader(
                new PageInputStream(writer, this, store, logKey, logFirstTrunkPage, logFirstDataPage, pageSize)
        );
        writer.println("---- Transaction log ----");
        CompressLZF compress = new CompressLZF();
        while (true) {
            int x = in.readByte();
            if (x < 0) {
                break;
            }
            if (x == PageLog.NOOP) {
                // ignore
            } else if (x == PageLog.UNDO) {
                int pageId = in.readVarInt();
                int size = in.readVarInt();
                byte[] data = new byte[pageSize];
                if (size == 0) {
                    in.readFully(data, 0, pageSize);
                } else if (size == 1) {
                    // empty
                } else {
                    byte[] compressBuffer = new byte[size];
                    in.readFully(compressBuffer, 0, size);
                    try {
                        compress.expand(compressBuffer, 0, size, data, 0, pageSize);
                    } catch (ArrayIndexOutOfBoundsException e) {
                        throw DbException.convertToIOException(e);
                    }
                }
                String typeName = "";
                int type = data[0];
                boolean last = (type & Page.FLAG_LAST) != 0;
                type &= ~Page.FLAG_LAST;
                switch (type) {
                case Page.TYPE_EMPTY:
                    typeName = "empty";
                    break;
                case Page.TYPE_DATA_LEAF:
                    typeName = "data leaf " + (last ? "(last)" : "");
                    break;
                case Page.TYPE_DATA_NODE:
                    typeName = "data node " + (last ? "(last)" : "");
                    break;
                case Page.TYPE_DATA_OVERFLOW:
                    typeName = "data overflow " + (last ? "(last)" : "");
                    break;
                case Page.TYPE_BTREE_LEAF:
                    typeName = "b-tree leaf " + (last ? "(last)" : "");
                    break;
                case Page.TYPE_BTREE_NODE:
                    typeName = "b-tree node " + (last ? "(last)" : "");
                    break;
                case Page.TYPE_FREE_LIST:
                    typeName = "free list " + (last ? "(last)" : "");
                    break;
                case Page.TYPE_STREAM_TRUNK:
                    typeName = "log trunk";
                    break;
                case Page.TYPE_STREAM_DATA:
                    typeName = "log data";
                    break;
                default:
                    typeName = "ERROR: unknown type " + type;
                    break;
                }
                writer.println("-- undo page " + pageId + " " + typeName);
                if (trace) {
                    Data d = Data.create(null, data);
                    dumpPage(writer, d, pageId, pageCount);
                }
            } else if (x == PageLog.ADD) {
                int sessionId = in.readVarInt();
                setStorage(in.readVarInt());

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        stat.pageDataEmpty += empty;
        if (trace) {
            writer.println("--   empty: " + empty);
        }
        if (!last) {
            Data s2 = Data.create(this, pageSize);
            s.setPos(pageSize);
            long parent = pageId;
            while (true) {
                checkParent(writer, parent, new int[]{(int) next}, 0);
                parent = next;
                seek(next);
                store.readFully(s2.getBytes(), 0, pageSize);
                s2.reset();
                int type = s2.readByte();
                s2.readShortInt();
                s2.readInt();
                if (type == (Page.TYPE_DATA_OVERFLOW | Page.FLAG_LAST)) {
                    int size = s2.readShortInt();
                    writer.println("-- chain: " + next + " type: " + type + " size: " + size);
                    s.checkCapacity(size);
                    s.write(s2.getBytes(), s2.length(), size);
                    break;
                } else if (type == Page.TYPE_DATA_OVERFLOW) {
                    next = s2.readInt();
                    if (next == 0) {
                        writeDataError(writer, "next:0", s2.getBytes());
                        break;
                    }
                    int size = pageSize - s2.length();
                    writer.println("-- chain: " + next + " type: " + type + " size: " + size + " next: " + next);
                    s.checkCapacity(size);
                    s.write(s2.getBytes(), s2.length(), size);
                } else {
                    writeDataError(writer, "type: " + type, s2.getBytes());
                    break;
                }
            }
        }
        for (int i = 0; i < entryCount; i++) {

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     * @return the page
     */
    static PageDataOverflow create(PageStore store, int page,
            int type, int parentPageId, int next,
            Data all, int offset, int size) {
        Data data = store.createData();
        PageDataOverflow p = new PageDataOverflow(store, page, data);
        store.logUndo(p, null);
        data.writeByte((byte) type);
        data.writeShortInt(0);
        data.writeInt(parentPageId);
        if (type == Page.TYPE_DATA_OVERFLOW) {
            data.writeInt(next);
        } else {
            data.writeShortInt(size);
        }
        p.start = data.length();
        data.write(all.getBytes(), offset, size);
        p.type = type;
        p.parentPageId = parentPageId;
        p.nextPage = next;
        p.size = size;
        return p;

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            file.setCheckedWriting(false);
            file.seek(FileStore.HEADER_LENGTH);
            rowBuff = Data.create(db, Constants.DEFAULT_PAGE_SIZE);
            file.seek(FileStore.HEADER_LENGTH);
        }
        Data buff = rowBuff;
        initBuffer(buff);
        for (int i = 0, size = list.size(); i < size; i++) {
            if (i > 0 && buff.length() > Constants.IO_BUFFER_SIZE) {
                flushBuffer(buff);
                initBuffer(buff);
            }
            Row r = list.get(i);
            writeRow(buff, r);

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